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Upsilon Carinae (υ Car, υ Carinae) is a double star in the southern constellation of Carina. It is part of the Diamond Cross asterism in southern Carina. The Upsilon Carinae system has a combined apparent magnitude of +2.97〔 and is approximately 1,400 light years (440 parsecs) from Earth.〔 In Chinese, (), meaning ''Sea Rock'', refers to an asterism consisting of υ Carinae, ε Carinae, ι Carinae, HD 83183 and HD 84810.〔 ''中國星座神話'', written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.〕 Consequently, υ Carinae itself is known as (, (英語:the Fifth Star of Sea Rock).)〔 (AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 28 日 )〕 The primary component, υ Carinae A, has a stellar classification of A8 Ib, making it a supergiant star that has exhausted the hydrogen at its core and evolved away from its brief main sequence lifetime as an O9 V star.〔 With an apparent magnitude of +3.08,〔 it has an effective temperature of about 7,600 K,〔 giving it a white hue. The companion, υ Carinae B, is a giant star with a classification of B7 III,〔 although Mandrini and Niemela (1986) suggested it may be a subgiant star with a classification of B4–5 IV.〔 The outer envelope of this star has an effective temperature of around 23,000 K, resulting in the blue-white hue of a B-type star. The two stars have an angular separation of 5.030 arcseconds. As a binary star system, they would have an estimated orbital period of at least 19,500 years and a present-day separation of around 2,000 Astronomical Units.〔 This system is roughly 12 million years old.〔 In the next 7500 years, the south Celestial pole will pass close to this stars and Iota Carinae (8100 CE).〔http://myweb.tiscali.co.uk/moonkmft/Articles/Precession.html〕 ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Upsilon Carinae」の詳細全文を読む スポンサード リンク
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